but the questioner is asking about 5.16.3 - is it true for that version as wellThat was my first thought, too ... but Strawberry 5.16.3 *does* provide GD-2.49 (according to
http://strawberryperl.com/release-notes/5.16.3.1-64bit.html).
And then there's the question of the missing gdlib-config. Strawberry 5.18.2 provides gdlib-config.bat, and I would've expected 5.16.3 to do the same (unverified).
I'm actually wondering whether the OP is, in fact, running Strawberry Perl.
Anyway ... if it's Strawberry Perl, then the OP should already have GD installed, and if it's ActivePerl then installing via PPM should work:
ppm install http://www.sisyphusion.tk/ppm/GD.ppd --force
Cheers,
Rob